Re: TypeError: __str__ returned non-string (type bytes)

> Den 25/02/2015 kl. 05.33 skrev Mike Dewhirst <miked@dewhirst.com.au>:
>
> ======================================================================
> ERROR: test_checkreference_exp (substance.tests.test_substance.TestSubstance)
> ----------------------------------------------------------------------
> Traceback (most recent call last):
> File "C:\Users\mike\env\xxdx3\ssds\substance\tests\test_substance.py", line 57, in test_checkreference_exp
> self.assertEqual(subst.checkreference('1'), True)
> File "C:\Users\mike\env\xxdx3\ssds\substance\models\substance.py", line 449, in checkreference
> if checkit(self, ref):
> File "C:\Users\mike\env\xxdx3\ssds\substance\models\substance.py", line 441, in checkit
> val = u"{0}".format(obj.__dict__[field])
> TypeError: __str__ returned non-string (type bytes)

"obj.__dict__[field]" returns an object that has a __str__ method (format() calls the __str__ method of the object to convert it to a string). The __str__ method should only return unicode data but is returning byte strings. What does "obj.__dict__[field]" return, and can you show us the __str__ method of that class?

Erik

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